OK BUTTON:

SPoT has a separate power button to ensure long battery life and to help avoid sending messages accidentally. To turn SPoT on, press the ON/OFF button. You must then wait an additional 2 seconds before activating any SPoT function. When power is on, the indicator light will blink once every 3 seconds. This is also helpful for making SPoT more visible in the dark. To turn SPoT off, press and hold the ON/OFF button for 3 seconds